I posted this in another part of the forum, but i think its a good setup so i posted it again. Just a little over your budget, but can be fixed by getting a cheaper mouse/keyboard, and the video card has a mail in rebate.

Thats $930 before shipping for a killer system, just add an lcd and youre good to go. I didnt choose an sli board, because sli is overated, the performace per dollar ratio is too low, it doesnt really give double the performance, espcially at lower resolutions.